Roller Chain Sprocket (06B, 13 teeth)
A sprocket for 06B roller chain — 3/8in (9.525mm) pitch, 6.35mm rollers, the common British standard size. 13 teeth, 39.8mm pitch diameter, 44.4mm over the tips, 5mm plate, 8mm bore. The tooth form follows ISO 606: the seating curve the roller actually beds into is 3.21mm radius (0.505×roller), swept through a 133.1° seating angle, on a root diameter of 33.5mm. Two things are worth saying plainly. ISO 606 is behind a paywall, so the tooth form here is taken from its verbatim reproduction inside granted patents and cross-checked between two of them; the seating curve — the part that matters, because it is the only part the chain touches — is corroborated, while the topping curve could not be sourced at all and the teeth are simply topped on the ANSI outside diameter instead. That is a real simplification and a small one: tip length is not what makes a chain mesh. Prints flat, no support. PETG or nylon — a sprocket in PLA will shear a tooth off under a shock load.
from £1.82example, in PLA
Example pricing
A guide only — not a fixed quote. Final price depends on material, quantity, print orientation and printability.
| Material | 1 unit | 5 units | 10 units | 25 units |
|---|---|---|---|---|
| PLA | £1.82 | £7.64£1.53/unit | £13.82£1.38/unit | £30.91£1.24/unit |
| PETG | £1.92 | £8.06£1.61/unit | £14.59£1.46/unit | £32.64£1.31/unit |
| ABS / ASA | £2.15 | £9.03£1.81/unit | £16.33£1.63/unit | £36.54£1.46/unit |
Per-unit prices fall with quantity. Larger batches are cheaper still — ask for a bulk quote.